I have been a Titanic buff since I was a kid 50 years ago. A Night to Remember is in no way a definitive depiction. Cameron's Titanic is the only movie ever that really gives you a feel for the ship, shows you what it actually looked like, and really shows the horror, panic and heartbreak of the tragedy.
At the end of Titanic, there's really very little you don't know about the ship and the sinking. A Night to Remember doesn't begin to compare.
Fake but Accurate
What mars Cameron's film, IMHO, is the class struggle that underscores the narrative. Yes, if the political "us against them" points made throughout the film are overlooked, 1997's Titanic does have some very redeeming points with its use of technology not available when the 1958 film based on Lord's book was released.
I also admit to getting a kick out of the Lewis Bodine character ("you seein' this boss?"), with his Texas shirt not visible in the image below:
A couple of interesting articles refute that it was all about class.
In Search of Chivalry is from the National Review.
And there are the Casulty Figures showing third class women were 41% more likely to survive than first class men. And third class men were twice as likely to survive as second class men.
Those are the inconvenient truths overlooked by James Cameron.
Other than the fact, not generally realized at the time, that the ship split in two, there is very little about the facts of Cameron’s film that are any where near as accurate as A Night To Remember.
Now, at the end of Titanic, there are lots of things you know about the ship and its crew and passengers that DID NOT HAPPEN. From makeup on society women that would have branded them tarts, to shooting passengers and suicides that never occurred, there’s a lot there to unlearn!